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CP Shielding and Pipeline Coatings

CP Shielding and Pipeline Coatings
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Shielding of cathodic protection (CP) by pipeline coatings poses a serious threat to pipeline integrity.  The difficulty in pipeline coating selection to avoid shielding is that the same properties that make a pipeline coating a good corrosion mitigation material can also lead to CP shielding. The key to proper coating selection is to select a coating that has the necessary properties to provide good corrosion protection but also one that, when disbondment and failure occurs, fails in such a way to allow effective cathodic protection.

Product Number: 41206-285-SG
Author: Greg Ruschau
Publication Date: 2006
Industries: Coatings , Pipelines, Tanks, and Underground Systems , Corrosion Monitoring and Control
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$20.00
$20.00

Shielding of cathodic protection (CP) by pipeline coatings poses a serious threat to pipeline integrity.  The difficulty in pipeline coating selection to avoid shielding is that the same properties that make a pipeline coating a good corrosion mitigation material can also lead to CP shielding. The key to proper coating selection is to select a coating that has the necessary properties to provide good corrosion protection but also one that, when disbondment and failure occurs, fails in such a way to allow effective cathodic protection.

Shielding of cathodic protection (CP) by pipeline coatings poses a serious threat to pipeline integrity.  The difficulty in pipeline coating selection to avoid shielding is that the same properties that make a pipeline coating a good corrosion mitigation material can also lead to CP shielding. The key to proper coating selection is to select a coating that has the necessary properties to provide good corrosion protection but also one that, when disbondment and failure occurs, fails in such a way to allow effective cathodic protection.

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Picture for Coatings Used in Conjunction with Cathodic Protection - Shielding vs NonShielding Pipeline Coatings
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Coatings Used in Conjunction with Cathodic Protection - Shielding vs NonShielding Pipeline Coatings

Product Number: 41212-693-SG
Author: Richard Norsworthy
Publication Date: 2012
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When using cathodic protection on coated pipelines, end users must consider the problems that exist if the coating disbonds (loses adhesion).  Many in the pipeline industry assume cathodic protection will solve their external corrosion problems without truly understanding the relationship between the coating and cathodic protection.  
Picture for 06043 DETERMINING THE CP SHIELDING BEHAVIOR
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06043 DETERMINING THE CP SHIELDING BEHAVIOR OF PIPELINE COATINGS IN THE LABORATORY

Product Number: 51300-06043-SG
ISBN: 06043 2006 CP
Author: G.R. Ruschau, Y.Chen
Publication Date: 2006
$20.00

The tendency of pipeline girth weld coatings to shield cathodic protection (CP) current was studied in the laboratory. Epoxy, epoxypolyurethane, polyurethane, and wax were investigated.  Results showed that the liquid coatings, when applied extra thin to accelerate the kinetics of absorption and current transmission, all disbonded by blistering, and all allowed CP current to be transmitted.
Qualification Testing of Fusion Bonded Epoxy Coatings for Pipeline Exteriors
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Qualification Testing of Fusion Bonded Epoxy Coatings for Pipeline Exteriors

Product Number: 41206-288-SG
Author: Kenneth B. Tator
Publication Date: 2006
$20.00

The selection of a coating for suitable use on the exterior of a pipeline is an important consideration due to the safety and cost consequences of potential corrosion.  Because there are numerous fusion bonded epoxy (FBE) mainline and field joint coating systems available, the selection of the optimum coating system is as much an art as a science. 
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